CN103675389B - A kind of alternating-current and direct-current dual-purpose voltage transformer - Google Patents
A kind of alternating-current and direct-current dual-purpose voltage transformer Download PDFInfo
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- CN103675389B CN103675389B CN201310652856.2A CN201310652856A CN103675389B CN 103675389 B CN103675389 B CN 103675389B CN 201310652856 A CN201310652856 A CN 201310652856A CN 103675389 B CN103675389 B CN 103675389B
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Abstract
The invention discloses a kind of alternating-current and direct-current dual-purpose voltage transformer, be series between high voltage bus and common ground end, for monitoring the supply voltage information of high voltage bus and sending the control unit of locomotive to；Its voltage signal processing unit (7) includes unidirectional current identification circuit, alternating current identification circuit, unidirectional current output control circuit and alternating current output control circuit；The input of unidirectional current identification circuit and the input of alternating current identification circuit are connected in parallel on the outfan of protection device (6)；The outfan of unidirectional current identification circuit electrically connects with the input of unidirectional current output control circuit；The outfan of alternating current identification circuit electrically connects with the input of alternating current output control circuit；The outfan of unidirectional current output control circuit is connected in parallel on aviation socket (8) with the outfan of alternating current output control circuit.The embodiment of the present invention can be applied not only to two kinds of power systems of AC and DC, and simple in construction, reliability height, highly versatile, is easily installed.
Description
Technical field
The present invention relates to electricity for locomotive pressure transformer field, particularly relate to a kind of alternating-current and direct-current dual-purpose voltage transformer.
Background technology
Along with the development of electric railway, rail facility is more and more higher to the performance requirement of voltage transformer.At present, mostly
Number electric locomotive is to use electromagnetic potential transformer to monitor contact net voltage；But below electromagnetic potential transformer exists
Shortcoming: 1. electromagnetic potential transformer relies primarily on iron core and operates, hence in so that electromagnetic potential transformer not only volume
Greatly, cost high, and be not easy to install；2. the iron core of electromagnetic potential transformer easily produces resonance, therefore electromagnetic type
Voltage transformer is easily subject to the impact of resonance and causes overall damage；3. the Secondary Winding side of electromagnetic potential transformer
Output voltage is generally 100v, and therefore electromagnetic potential transformer can not be joined directly together with the control unit of electric locomotive.
In order to overcome the disadvantages mentioned above of electromagnetic potential transformer, some manufacturers start to research and develop the electronics used in electric locomotive
Formula voltage transformer, and use electronic type voltage transformer to monitor contact net voltage；But, existing electronic type voltage
Transformer at least there is also following deficiency:
The most existing electronic type voltage transformer may be only available for AC electric power systems, it is impossible to applies in direct current power system,
This severely limits the range of application of electronic type voltage transformer.
The protection device of the most existing electronic type voltage transformer have employed the protective measure of common voltage transformer, the most fully
The factors such as the feature of the consideration complex electromagnetic environment of electric locomotive self, the operation characteristic of electric locomotive and acquisition electric energy, because of
The protective capability of this its protection device is more weak, is likely to result in the overall damage of electronic type voltage transformer.
Summary of the invention
The main object of the present invention is to provide a kind of alternating-current and direct-current dual-purpose voltage transformer, can be applied not only to exchange and
Two kinds of power systems of direct current, and simple in construction, reliability height, highly versatile, be easily installed.
It is an object of the invention to be achieved through the following technical solutions:
A kind of alternating-current and direct-current dual-purpose voltage transformer, is series between high voltage bus and common ground end, including: insulation
Shell 1, casing 2, high-voltage arm resistance 4, low-voltage arm resistance 5, protection device 6, voltage signal processing unit 7 and aviation are inserted
Seat 8；
Insulation crust 1 is arranged between the top of casing 2, and insulation crust 1 and casing 2 and is provided with positioning seat 3；
The inside of insulation crust 1 is provided with cavity 11；High-voltage arm resistance 4, low-voltage arm resistance 5 and protection device 6 are all located at this sky
In chamber 11；The high-pressure side of high-voltage arm resistance 4 electrically connects with the high-field electrode binding post 9 being located at insulation crust 1 top, and should
High-field electrode binding post 9 electrically connects with high voltage bus；The low-pressure end of high-voltage arm resistance 4 is electrically connected with the high-pressure side of low-voltage arm resistance 5
Connecing, the low-pressure end of low-voltage arm resistance 5 electrically connects with common ground end；The input of protection device 6 is with low-voltage arm resistance 5 also
Connection；
Voltage signal processing unit 7 is located at the inside of casing 2, and the input of voltage signal processing unit 7 and protection device
The outfan electrical connection of 6；Aviation socket 8 is located at the outside of casing 2, and the outfan of voltage signal processing unit 7 and boat
Dummy receptacle 8 electrically connects；
Voltage signal processing unit 7 include unidirectional current identification circuit, alternating current identification circuit, unidirectional current output control circuit and
Alternating current output control circuit；The input of unidirectional current identification circuit and the input of alternating current identification circuit are connected in parallel on protection
The outfan of device 6；The outfan of unidirectional current identification circuit electrically connects with the input of unidirectional current output control circuit；Exchange
The electricity outfan of identification circuit electrically connects with the input of alternating current output control circuit；Unidirectional current output control circuit defeated
The outfan going out end and alternating current output control circuit is connected in parallel on aviation socket 8.
Preferably, described unidirectional current identification circuit includes: the first high impedance voltage follow circuit, the 15th resistance R15,
7th diode D7, the 4th 1 resistance R41, the four or two electric capacity C42, the first voltage comparator circuit, the first analog switch core
Sheet U7 and the second high impedance voltage follow circuit；
The input of the first high impedance voltage follow circuit electrically connects with the outfan of protection device 6；First high impedance voltage with
The 15th resistance R15 and one end of the four or two electric capacity C42 and the first of the first voltage comparator circuit is passed through with the outfan of circuit
Relatively voltage input end electrical connection；The other end of the four or two electric capacity C42 electrically connects with common ground end；
The negative electrode of the 7th diode D7 and the outfan electrical connection of the first high impedance voltage follow circuit；7th diode D7's
Anode and the 4th 1 resistance R41 series connection, and it is connected electrically in the 15th resistance R15 and the four or two electricity by the 4th 1 resistance R41
Hold between C42；
The second of first voltage comparator circuit is compared voltage input end and accesses more than or equal to 0.18V, and less than 0.24V's
DC input voitage；The comparative result outfan of the first voltage comparator circuit and the chip selection signal of the first analog switch chip U7
Input pin In electrically connects；
The first voltage input pin SA of the first analog switch chip U7 electrically connects with common ground end；First analog switch core
The second voltage input pin SB of sheet U7 and the outfan electrical connection of the first high impedance voltage follow circuit；First analog switch
The voltage output pin D of chip U7 and the input electrical connection of the second high impedance voltage follow circuit, and by the second high resistant
Reactance voltage follow circuit electrically connects with the input of unidirectional current output control circuit.
Preferably, described alternating current identification circuit includes: the 3rd high impedance voltage follow circuit, the 4th zero resistance R40,
Seven or two diode D72, the 9th 2 diode D92, the eight or two diode D82, the 2nd 91 resistance R291, the four or two
Resistance R42, the 5th electric capacity C5, the second voltage comparator circuit and the second analog switch chip U82；
The input of the 3rd high impedance voltage follow circuit electrically connects with the outfan of protection device 6；3rd high impedance voltage with
Electrically connected by the anode of the 4th zero resistance R40 and the seven or two diode D72 with the outfan of circuit；Seven or two diode
The negative electrode of D72 and the anode electrical connection of the 9th 2 diode D92；The negative electrode of the 9th 2 diode D92 and the eight or two diode
The anode electrical connection of D82；The negative electrode of the eight or two diode D82 and one end of the 5th electric capacity C5 and the second voltage comparator circuit
First compares voltage input end electrical connection；The other end of the 5th electric capacity C5 electrically connects with common ground end；
One end of 2nd 91 resistance R291 electrically connects with the anode of the seven or two diode D72, and the 2nd 91 resistance R291
The other end and the 9th 2 diode D92 negative electrode electrical connection；One end of four or two resistance R42 and the eight or two diode D82
Anode electrical connection, and the negative electrode of the other end of the four or two resistance R42 and the eight or two diode D82 electrically connect；
The second of second voltage comparator circuit is compared voltage input end and accesses more than or equal to 1.6V, and the direct current less than 8V
Input voltage；The comparative result outfan of the second voltage comparator circuit and the chip selection signal input of the second analog switch chip U82
Pin In electrically connects；
The first voltage input pin SA of the second analog switch chip U82 electrically connects with common ground end；Second analog switch
The second voltage input pin SB of chip U82 and the outfan electrical connection of the 3rd high impedance voltage follow circuit；Second simulation
The voltage output pin D of switch chip U82 electrically connects with the input of alternating current output control circuit.
Preferably, described alternating current output control circuit includes: the one or three operational amplifier U13, the diode July 1st
D71, the 2nd 1 resistance R21, the 4th audion T4, the 2nd 41 resistance R241, the 8th 1 diode D81, second
Eight resistance R28, the 6th audion T6, second May Day resistance R251 and the two or seven resistance R27；
The in-phase input end of the one or three operational amplifier U13 electrically connects with the outfan of alternating current identification circuit；One or three computing
The inverting input of amplifier U13 and one end electrical connection of the two or seven resistance R27, and as this alternating current output control circuit
A current output terminal electrically connect with aviation socket 8；The other end of the two or seven resistance R27 electrically connects with common ground end；
The outfan of the one or three operational amplifier U13 and the negative electrode electrical connection of the diode D71 July 1st；The July 1st diode
The anode of D71 is electrically connected by the 2nd 1 resistance R21 and+15V voltage input end；The base stage and the 7th of the 4th audion T4
The anode electrical connection of one diode D71；The colelctor electrode of the 4th audion T4 electrically connects with+15V voltage input end；Four or three
The emitter stage of pole pipe T4 and one end electrical connection of the 2nd 41 resistance R241；
The outfan of the one or three operational amplifier U13 and the anode electrical connection of the 8th 1 diode D81；8th 1 diode
The negative electrode of D81 is electrically connected by the two or eight resistance R28 and-15V voltage input end；The base stage and the 8th 1 of the 6th audion T6
The negative electrode electrical connection of diode D81；The colelctor electrode of the 6th audion T6 electrically connects with-15V voltage input end；Six or three pole
The emitter stage of pipe T6 and second May Day resistance R251 one end electrical connection；
The other end of the 2nd 41 resistance R241 and second May Day resistance R251 other end electrical connection after, as this alternating current
Another current output terminal of output control circuit electrically connects with aviation socket 8.
Preferably, described unidirectional current output control circuit includes: analog to digital conversion circuit, central processing element and digital-to-analogue turn
Change circuit；
Central processing element is electrically connected with the outfan of unidirectional current identification circuit by analog to digital conversion circuit, thus obtains direct current
The voltage signal of electricity；Central processing element is electrically connected with aviation socket 8 by D/A converting circuit, so that aviation socket 8
Output unidirectional current.
Preferably, the outside of described casing 2 is provided with work condition indicator；Alternating current output control circuit includes exchange
Working state feedback circuit；Central processing element electrically connects with alternate current operation state-feedback circuit, and refers to duty
Showing device electrically connects.
Preferably, described protection device 6 includes: discharge tube G1, the first resettable fuse Ra, the second self-recoverage are protected
Danger silk Rn and the first transient voltage protection diode TVS1；
One end of first resettable fuse Ra electrically connects with one end of discharge tube G1, and as protection device 6 is defeated
Enter end to electrically connect with the high-pressure side of low-voltage arm resistance 5；The other end of the first resettable fuse Ra and the protection of the first transient voltage
One end electrical connection of diode TVS1, and the input of an outfan and the voltage signal processing unit 7 as protection device 6
End electrical connection；
One end of second resettable fuse Rn electrically connects with the other end of discharge tube G1 and common ground end, and as protection
Another input of device 6 electrically connects with the low-pressure end of low-voltage arm resistance 5；The other end of the second resettable fuse Rn with
First transient voltage protection diode TVS1 the other end electrical connection, and as protection device 6 another outfan with electricity
The input electrical connection of pressure signal processing unit 7.
As seen from the above technical solution provided by the invention, the alternating-current and direct-current dual-purpose electricity that the embodiment of the present invention is provided
The voltage signal processing unit 7 of pressure transformer includes unidirectional current identification circuit and alternating current identification circuit, unidirectional current identification circuit
In parallel with low-voltage arm resistance 5 by protection device 6 with alternating current identification circuit；Unidirectional current through protection device 6 can only pass through
Unidirectional current identification circuit enters unidirectional current output control circuit, it is impossible to by alternating current identification circuit, and through protection device 6
Alternating current can only by alternating current identification circuit enter alternating current output control circuit, it is impossible to by unidirectional current identification electricity
Road, therefore enables voltage transformer provided by the present invention be applicable to two kinds of power systems of AC and DC, and structure
Simply, reliability height, highly versatile, be easily installed.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain according to these accompanying drawings
Other accompanying drawings.
The structural representation of the voltage transformer that Fig. 1 provides for the embodiment of the present invention；
The electrical block diagram of the voltage transformer that Fig. 2 provides for the embodiment of the present invention；
Fig. 3 provides the circuit theory schematic diagram of the protection device of voltage transformer for the embodiment of the present invention；
Fig. 4 provides the circuit theory schematic diagram of the unidirectional current identification circuit of voltage transformer for the embodiment of the present invention；
Fig. 5 provides the circuit theory schematic diagram of the alternating current identification circuit of voltage transformer for the embodiment of the present invention；
Fig. 6 provides the circuit theory schematic diagram one of the unidirectional current output control circuit of voltage transformer for the embodiment of the present invention；
Fig. 7 provides the circuit theory schematic diagram two of the unidirectional current output control circuit of voltage transformer for the embodiment of the present invention；
Fig. 8 provides the circuit theory schematic diagram of the alternating current output control circuit of voltage transformer for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on
Embodiments of the invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into protection scope of the present invention.
Firstly the need of explanation, the alternating-current and direct-current dual-purpose voltage transformer that the embodiment of the present invention is provided goes for
The occasion of high voltage bus transmission DC1500V voltage (i.e. unidirectional current 1500V), it is also possible to be applicable to high voltage bus transmission
The occasion of AC25kV voltage (i.e. alternating current 25kV)；When the voltage of high voltage bus transmission DC1500V, this voltage is mutual
The aviation socket 8 of sensor can export the unidirectional current of 15mA；When the voltage of high voltage bus transmission AC25kV, this voltage is mutual
The aviation socket 8 of sensor can export the alternating current of 25mA.
The alternating-current and direct-current dual-purpose voltage transformer provided the embodiment of the present invention below is described in detail.
Embodiment one
As shown in Figures 1 to 6, a kind of alternating-current and direct-current dual-purpose voltage transformer, it is series at high voltage bus and common ground end
Between, its concrete structure may include that insulation crust 1, casing 2, high-voltage arm resistance 4, low-voltage arm resistance 5, protection dress
Put 6, voltage signal processing unit 7 and aviation socket 8；
Insulation crust 1 is arranged between the top of casing 2, and insulation crust 1 and casing 2 and is provided with positioning seat 3；Insulation crust
The inside of 1 is provided with cavity 11；High-voltage arm resistance 4, low-voltage arm resistance 5 and protection device 6 are all located in this cavity 11；High pressure
The high-pressure side of arm resistance 4 electrically connects with the high-field electrode binding post 9 being located at insulation crust 1 top, and this high-field electrode wiring
Post 9 electrically connects with high voltage bus；The low-pressure end of high-voltage arm resistance 4 electrically connects with the high-pressure side of low-voltage arm resistance 5, low-voltage arm electricity
The low-pressure end of resistance 5 electrically connects with common ground end；The input of protection device 6 is in parallel with low-voltage arm resistance 5；At voltage signal
Reason unit 7 is located at the inside of casing 2, and the outfan of the input of voltage signal processing unit 7 and protection device 6 is electrically connected
Connect；Aviation socket 8 is located at the outside of casing 2, and the outfan of voltage signal processing unit 7 is electrically connected with aviation socket 8
Connect.Aviation socket 8 can be connected with shielded cable, it is possible to drives the load of 200 ohm.
Wherein, as in figure 2 it is shown, voltage signal processing unit 7 can include unidirectional current identification circuit, alternating current identification electricity
Road, unidirectional current output control circuit and alternating current output control circuit；The input of unidirectional current identification circuit and alternating current are known
The input of other circuit is connected in parallel on the outfan of protection device 6；The outfan of unidirectional current identification circuit controls with unidirectional current output
The input electrical connection of circuit；The outfan of alternating current identification circuit is electrically connected with the input of alternating current output control circuit
Connect；The outfan of unidirectional current output control circuit is connected in parallel on aviation socket 8 with the outfan of alternating current output control circuit.
Specifically, the specific embodiments of each parts of this alternating-current and direct-current dual-purpose voltage transformer may include that
(1) unidirectional current identification circuit: as shown in Figure 2 and Figure 4, this unidirectional current identification circuit may include that the first high impedance
Voltage follower circuit, the 15th resistance R15, the 7th diode D7, the 4th 1 resistance R41, the four or two electric capacity C42,
One voltage comparator circuit, the first analog switch chip U7 and the second high impedance voltage follow circuit；
The input of the first high impedance voltage follow circuit electrically connects with the outfan of protection device 6；First high impedance voltage with
The 15th resistance R15 and one end of the four or two electric capacity C42 and the first of the first voltage comparator circuit is passed through with the outfan of circuit
Relatively voltage input end electrical connection；The other end of the four or two electric capacity C42 electrically connects with common ground end；7th diode D7
Negative electrode and the first high impedance voltage follow circuit outfan electrical connection；The anode of the 7th diode D7 and the 4th 1 resistance
R41 connects, and is connected electrically between the 15th resistance R15 and the four or two electric capacity C42 by the 4th 1 resistance R41；First
The second of voltage comparator circuit is compared voltage input end and accesses more than or equal to 0.18V, and the direct current input less than 0.24V
Voltage；The comparative result outfan of the first voltage comparator circuit and the chip selection signal input pin of the first analog switch chip U7
In electrically connects；The first voltage input pin SA of the first analog switch chip U7 electrically connects with common ground end；First simulation
The second voltage input pin SB of switch chip U7 and the outfan electrical connection of the first high impedance voltage follow circuit；First mould
Intend the input electrical connection of voltage output pin D and the second high impedance voltage follow circuit of switch chip U7, and pass through the
Two high impedance voltage follow circuits electrically connect with the input of unidirectional current output control circuit.
Wherein, in order to ensure that unidirectional current identification circuit has higher certainty of measurement, the input of this unidirectional current identification circuit
Being provided with the first high impedance voltage follow circuit of input high impedance, this first high impedance voltage follow circuit can use existing
There is the high impedance voltage follow circuit in technology, it is desirable that use the high impedance voltage with operational amplifier as core to follow electricity
Road, such as: the high impedance voltage follow circuit with the one nine one operational amplifier U19A as core as shown in Figure 4.The
Two high impedance voltage follow circuits can also use high impedance voltage follow circuit of the prior art, it is desirable that be also adopted by with
Operational amplifier is the high impedance voltage follow circuit of core, such as: as shown in Figure 4 with the one nine three operational amplifier
U19C is the high impedance voltage follow circuit of core.First voltage comparator circuit is preferably with as shown in Figure 4 with the 1st
Operational amplifier U19D is the comparison circuit of core.The second of first voltage comparator circuit compares what voltage input end was accessed
DC input voitage is preferably 0.18V, and preferably with circuit structure as shown in Figure 4, the i.e. first voltage comparator circuit
Second compare voltage input end and be connected electrically between the one or seven resistance R17 and the one or three resistance R13, and by the one or seven
Resistance R17 electrically connects with common ground end, is electrically connected by the one or three resistance R13 and+15V voltage input end；In reality
In application, the resistance value of the one or three resistance R13 is preferably 56k Ω, and the resistance value of the one or seven resistance R17 is preferably 400 Ω,
So that the second voltage comparing voltage input end is 0.18V.
Herein it should be noted that the method for attachment of other pins of the first analog switch chip U7 is all referred to existing skill
In art, the custom circuit of analog switch chip connects, and repeats no more in the application.This unidirectional current identification circuit can also basis
Actual demand arranges the custom circuits such as protection circuit, mu balanced circuit according to prior art, these routines in the prior art
Circuit structure the application repeats no more.
(2) alternating current identification circuit: as shown in Figure 2 and Figure 5, this alternating current identification circuit may include that the 3rd high impedance
Voltage follower circuit, the 4th zero resistance R40, the seven or two diode D72, the 9th 2 diode D92, the eight or two diode
D82, the 2nd 91 resistance R291, the four or two resistance R42, the 5th electric capacity C5, the second voltage comparator circuit and the second mould
Intend switch chip U82；
The input of the 3rd high impedance voltage follow circuit electrically connects with the outfan of protection device 6；3rd high impedance voltage with
Electrically connected by the anode of the 4th zero resistance R40 and the seven or two diode D72 with the outfan of circuit；Seven or two diode
The negative electrode of D72 and the anode electrical connection of the 9th 2 diode D92；The negative electrode of the 9th 2 diode D92 and the eight or two diode
The anode electrical connection of D82；The negative electrode of the eight or two diode D82 and one end of the 5th electric capacity C5 and the second voltage comparator circuit
First compares voltage input end electrical connection；The other end of the 5th electric capacity C5 electrically connects with common ground end；2nd 91 resistance
One end of R291 electrically connects with the anode of the seven or two diode D72, and the other end and the 9th 2 of the 2nd 91 resistance R291
The negative electrode electrical connection of diode D92；One end of four or two resistance R42 electrically connects with the anode of the eight or two diode D82, and
The other end of the four or two resistance R42 and the negative electrode electrical connection of the eight or two diode D82；Second ratio of the second voltage comparator circuit
Relatively voltage input end accesses more than or equal to 1.6V, and the AC-input voltage less than 8V；Second voltage comparator circuit
The chip selection signal input pin In electrical connection of comparative result outfan and the second analog switch chip U82；Second analog switch core
The first voltage input pin SA of sheet U82 electrically connects with common ground end；Second voltage of the second analog switch chip U82
The outfan electrical connection of input pin SB and the 3rd high impedance voltage follow circuit；The voltage of the second analog switch chip U82
Output pin D electrically connects with the input of alternating current output control circuit.
Wherein, the second voltage input pin SB of the second analog switch chip U82 can be by the five or two resistance R52 and the
The outfan electrical connection of three high impedance voltage follow circuits.In order to ensure that alternating current identification circuit has higher measurement essence
Degree, the input of this alternating current identification circuit be provided with input high impedance the 3rd high impedance voltage follow circuit, the 3rd
High impedance voltage follow circuit can use high impedance voltage follow circuit of the prior art, puts it is desirable that use with computing
Big device is the high impedance voltage follow circuit of core, such as: as shown in Figure 5 with the one three two operational amplifier U13B be
The high impedance voltage follow circuit of core.Second voltage comparator circuit is preferably with as shown in Figure 5 with the one three three operation amplifier
Device U13C is the comparison circuit of core.The second of second voltage comparator circuit compares the direct current input that voltage input end is accessed
Voltage is preferably 1.6V, and preferably with circuit structure as shown in Figure 5, the second of the i.e. second voltage comparator circuit is compared
Voltage input end is connected electrically between Radix Notoginseng resistance R37 and the four or eight resistance R48, and by Radix Notoginseng resistance R37 with
+ 15V voltage input end electrically connects, and is electrically connected with common ground end by the four or eight resistance R48, the 9th electric capacity C9 and the 4th
Eight resistance R48 are in parallel；In actual applications, the resistance value of Radix Notoginseng resistance R37 is preferably 6.2k Ω, the four or eight resistance
The resistance value of R48 is preferably 56k Ω, so that the second voltage comparing voltage input end is 1.6V.
Herein it should be noted that the method for attachment of other pins of the second analog switch chip U82 is all referred to existing skill
In art, the custom circuit of analog switch chip connects, and repeats no more in the application.This alternating current identification circuit can also basis
Actual demand arranges the custom circuits such as protection circuit, mu balanced circuit according to prior art, these routines in the prior art
Circuit structure the application repeats no more.
(3) alternating current output control circuit: as shown in Figure 2 and Figure 8, this alternating current output control circuit may include that
One or three operational amplifier U13, the diode D71 July 1st, the 2nd 1 resistance R21, the 4th audion T4, the 2nd 41 electricity
Resistance R241, the 8th 1 diode D81, the two or eight resistance R28, the 6th audion T6, second May Day resistance R251 and the
Two or seven resistance R27；
The in-phase input end of the one or three operational amplifier U13 electrically connects with the outfan of alternating current identification circuit；One or three computing
The inverting input of amplifier U13 and one end electrical connection of the two or seven resistance R27, and as this alternating current output control circuit
A current output terminal electrically connect with aviation socket 8；The other end of the two or seven resistance R27 electrically connects with common ground end；
The outfan of the one or three operational amplifier U13 and the negative electrode electrical connection of the diode D71 July 1st；The July 1st diode D71
Anode is electrically connected by the 2nd 1 resistance R21 and+15V voltage input end；The base stage of the 4th audion T4 and the pole July 1st two
The anode electrical connection of pipe D71；The colelctor electrode of the 4th audion T4 electrically connects with+15V voltage input end；4th audion T4
Emitter stage and the 2nd 41 resistance R241 one end electrical connection；The outfan and the 8th 1 of the one or three operational amplifier U13
The anode electrical connection of diode D81；The negative electrode of the 8th 1 diode D81 is inputted with-15V voltage by the two or eight resistance R28
End electrical connection；The base stage of the 6th audion T6 electrically connects with the negative electrode of the 8th 1 diode D81；The collection of the 6th audion T6
Electrode electrically connects with-15V voltage input end；The emitter stage of the 6th audion T6 and second May Day resistance R251 one end be electrically connected
Connect；The other end of the 2nd 41 resistance R241 and second May Day resistance R251 other end electrical connection after, as this alternating current
Another current output terminal of output control circuit electrically connects with aviation socket 8.
Wherein, when the outfan of alternating current identification circuit is to the in-phase input end output AC electricity of the one or three operational amplifier U13
Time, the voltage of the inverting input of the one or the three operational amplifier U13 in-phase input end equal to the one or three operational amplifier U13
Input voltage Vi；Owing to the inverting input of the one or three operational amplifier U13 is directly electric with one end of the two or seven resistance R27
Connect, and a current output terminal as this alternating current output control circuit electrically connects with aviation socket 8, and the two or seven
The other end of resistance R27 electrically connects with common ground end, therefore after load electrically connects with aviation socket 8, and the two or seven resistance
R27 is equivalent to and load in series, and the electric current entering load through aviation socket 8 is consistently equal to flow through the two or seven resistance R27's
Electric current (I=Vi/R27), this is unrelated with the resistance value size of load, it is achieved thereby that the constant current output of exchange.Meanwhile, when
When what the outfan of the one or three operational amplifier U13 exported is positive half cycle alternating current, positive half cycle alternating current can be by by the 7th
The circuit output that one diode D71, the 2nd 1 resistance R21, the 4th audion T4 and the 2nd 41 resistance R241 are constituted
To aviation socket；When the one or three operational amplifier U13 outfan export be negative half period alternating current time, negative half period alternating current
Can by by the 8th 1 diode D81, the two or eight resistance R28, the 6th audion T6 and second May Day resistance R251 institute
The circuit constituted exports aviation socket.
(4) unidirectional current output control circuit: as shown in Fig. 2, Fig. 6 and Fig. 7, this unidirectional current output control circuit can wrap
Include: analog to digital conversion circuit, central processing element and D/A converting circuit；Central processing element by analog to digital conversion circuit with
The outfan electrical connection of unidirectional current identification circuit, thus obtain galvanic voltage signal；Central processing element passes through digital-to-analogue
Change-over circuit electrically connects with aviation socket 8, so that aviation socket 8 exports unidirectional current.
Wherein, the outfan of unidirectional current identification circuit directly electrically connects with analog to digital conversion circuit, and pass through analog to digital conversion circuit
VD is sent to central processing element, after central processing element gets VD, passes through digital-to-analogue
Change-over circuit exports unidirectional current to aviation socket 8.The outside of casing 2 can be provided with work condition indicator, for finger
Show that the electric current that aviation socket 8 exports is unidirectional current or alternating current；Central processing element can be with work condition indicator electricity
Connecting, owing to galvanic output is controlled by central processing element, therefore central processing element can be directly by aviation
Whether socket 8 has unidirectional current output to inform work condition indicator；Alternating current output control circuit can include alternate current operation
State-feedback circuit, central processing element electrically connects with alternate current operation state-feedback circuit, so that central processing element is also
Whether aviation socket 8 can have alternating current output inform work condition indicator.
Herein it should be noted that analog to digital conversion circuit can use analog to digital conversion circuit commonly known in the art or modulus
Conversion chip, it is desirable that use modulus conversion chip U8 as shown in Figure 7；D/A converting circuit can use in prior art
Known D/A converting circuit or analog-digital chip；Central processing element can use single-chip microcomputer of the prior art, example
As: single-chip microcomputer U10 as shown in Figure 7.Owing to analog to digital conversion circuit, single-chip microcomputer and D/A converting circuit belong to existing skill
Routine techniques in art, therefore repeats no more in the application.
(4) protection device 6: as shown in Figures 2 and 3, this protection device 6 may include that discharge tube G1, first from extensive
Double insurance silk Ra, the second resettable fuse Rn and the first transient voltage protection diode TVS1；
One end of first resettable fuse Ra electrically connects with one end of discharge tube G1, and as protection device 6 is defeated
Enter end to electrically connect with the high-pressure side of low-voltage arm resistance 5；The other end of the first resettable fuse Ra and the protection of the first transient voltage
One end electrical connection of diode TVS1, and the input of an outfan and the voltage signal processing unit 7 as protection device 6
End electrical connection；One end of second resettable fuse Rn electrically connects with the other end of discharge tube G1 and common ground end, and makees
Electrically connect with the low-pressure end of low-voltage arm resistance 5 for another input of protection device 6；Second resettable fuse Rn's is another
One end electrically connects with the other end of the first transient voltage protection diode TVS1, and as another output of protection device 6
End electrically connects with the input of voltage signal processing unit 7.
Wherein, discharge tube G1 is preferably with ceramic gas discharge tube；When high-voltage arm resistance 4 is breakdown or low-voltage arm resistance 5 is opened
Lu Shi, the outfan of low-voltage arm resistance 5 there will be high voltage, and this protection device 6 can suppress high voltage, thus ensures
Voltage signal processing unit 7 and the safety of operator.When having served as the input of high-voltage invasion protection device 6, first
Transient voltage protection diode TVS1 can turn on, thus suppresses too high voltages；If the input energy mistake of protection device 6
Height, electric current are relatively big, then the first resettable fuse Ra and the second resettable fuse Rn can become high-impedance state, too high
Voltage can be released by discharge tube G1, thus effectively protects the first transient voltage protection diode TVS1 and subsequent voltage letter
Number processing unit 7 is from high-tension infringement.
Further, the operation principle of this alternating-current and direct-current dual-purpose voltage transformer is as follows:
(1) when high voltage bus transmission be High Level AC Voltage (such as: AC25kV) time, by high-voltage arm resistance 4 with low
The dividing potential drop effect of pressure arm resistance 5, the High Level AC Voltage (such as: AC25kV) of bus can be converted to exchange small voltage signal
(such as: AC4V), and unidirectional current identification circuit and the alternating current of voltage signal processing unit 7 is entered by protection device 6
Identification circuit；
In unidirectional current identification circuit, when exchanging small voltage signal (such as: AC4V) and being in the positive half cycle of exchange, exchange
Small voltage signal can enter the four or two electric capacity C42 by the 15th resistance R15, thus the four or two electric capacity C42 charges；Work as friendship
When stream small voltage signal (such as: AC4V) is in exchange negative half period, in the four or two electric capacity C42, the electric energy of deposit can pass through
15th resistance R15 and the 4th 1 resistance R41 and two articles of branch roads of the 7th diode D7 flow out, thus the four or two electric capacity C42
Repid discharge；Compare voltage input end owing to the four or two electric capacity C42 is connected electrically in the first of the first voltage comparator circuit, work as friendship
When stream small voltage signal is in exchange negative half period, the repid discharge of the four or two electric capacity C42 can make first to compare voltage input end
Voltage be less than 0.18V, and the second of the first voltage comparator circuit compare voltage input end access be greater than or equal to 0.18V
And the DC input voitage less than 0.24V, therefore the comparative result outfan of the first voltage comparator circuit can make the first simulation hold
The chip selection signal input pin In closing chip U7 is 0；The first voltage input pin SA due to the first analog switch chip U7
Electrically connecting with common ground end, therefore the voltage output pin D of the first analog switch chip U7 can terminate with common ground
Logical, output signal is 0, it is achieved thereby that will be AC electrically isolated from.
In alternating current identification circuit, when exchanging small voltage signal (such as: AC4V) and being in the positive half cycle of exchange, exchange
Small voltage signal order can enter the by the seven or two diode D72, the 9th 2 diode D92 and the eight or two diode D82
Five electric capacity C5, thus the 5th electric capacity C5 charging；Now, the first of the second voltage comparator circuit compares the electricity of voltage input end
Pressure is equal to the exchange positive half cycle voltage of exchange small voltage signal, and the second of the second voltage comparator circuit compares voltage input end
Can access the DC input voitage equal to 1.6V, therefore the comparative result outfan of the second voltage comparator circuit can make second
The chip selection signal input pin In of analog switch chip U82 is 1；Owing to second voltage of the second analog switch chip U82 is defeated
Enter the outfan electrical connection of pin SB and the 3rd high impedance voltage follow circuit, the therefore electricity of the second analog switch chip U82
The output voltage of pressure output pin D is equal to the exchange positive half cycle voltage of exchange small voltage signal.When exchange small voltage signal (example
As: when AC4V) being in exchange negative half period, the 5th electric capacity C5 is only by the four or two resistance R42 and the 2nd 91 resistance
This branch road of R291 discharges, and puts spot speed slow；Owing to the 5th electric capacity C5 is connected electrically in the second voltage comparator circuit
First compare voltage input end, when exchanging small voltage signal and being in exchange negative half period, the slow electric discharge of the 5th electric capacity C5
Make the first minimum voltage comparing voltage input end also be not less than 1.6V, and the second of the second voltage comparator circuit compares voltage
Input can access the DC input voitage equal to 1.6V, therefore the comparative result outfan meeting of the second voltage comparator circuit
The chip selection signal input pin In making the second analog switch chip U82 is 1；Due to the second analog switch chip U82 second
The outfan electrical connection of voltage input pin SB and the 3rd high impedance voltage follow circuit, therefore the second analog switch chip
The output voltage of the voltage output pin D of U82 is equal to the exchange negative half period voltage of exchange small voltage signal.As fully visible, should
Alternating current identification circuit achieves the output of alternating current.
The alternating current of alternating current identification circuit output enters alternating current output control circuit, and by controlling with alternating current output
Aviation socket 8 constant current output of circuit electrical connection, the alternating current (such as: AC25mA) of its output and the high pressure of bus
Alternating current (such as: AC25kV) linearly ratio.
(2) when high voltage bus transmission be high voltage direct current (such as: DC1500V) time, by high-voltage arm resistance 4 with
The dividing potential drop effect of low-voltage arm resistance 5, the high voltage direct current (such as: DC1500V) of bus can be converted to direct current small voltage letter
Number (such as: DC0.24V), and by protection device 6 enter voltage signal processing unit 7 unidirectional current identification circuit and
Alternating current identification circuit；
In alternating current identification circuit, direct current small voltage signal (such as: DC0.24V) order can pass through the 7th 22 pole
Pipe D72, the 9th 2 diode D92 and the eight or two diode D82 enter the 5th electric capacity C5, thus are that the 5th electric capacity C5 fills
Electricity；Comparing voltage input end owing to the 5th electric capacity C5 is connected electrically in the first of the second voltage comparator circuit, the 5th electric capacity C5 makes
Second compares the voltage of voltage input end equal to direct current small voltage signal (i.e. 0.24V), and the of the second voltage comparator circuit
Two compare being greater than or equal to 1.6V and being less than the DC input voitage of 8V, therefore the second voltage ratio of voltage input end access
The comparative result outfan of relatively circuit can make the chip selection signal input pin In of the second analog switch chip U82 be 0；Due to
The first voltage input pin SA of two analog switch chip U82 electrically connects with common ground end, therefore the second analog switch core
The voltage output pin D of sheet U82 is logical with common ground termination, and output signal is 0, it is achieved thereby that isolated by unidirectional current.
In unidirectional current identification circuit, direct current small voltage signal (such as: DC0.24V) can be entered by the 15th resistance R15
Enter the four or two electric capacity C42, thus be the four or two electric capacity C42 charging；Owing to the four or two electric capacity C42 is connected electrically in the first voltage
The first of comparison circuit compares voltage input end, and the four or two electric capacity C42 makes first to compare the voltage of voltage input end equal to direct current
Small voltage signal (i.e. 0.24V), and the second of the first voltage comparator circuit compare voltage input end access be greater than or etc.
In 0.18V and less than the DC input voitage of 0.24V, therefore the comparative result outfan of the first voltage comparator circuit can make the
The chip selection signal input pin In of one analog switch chip U7 is 1；The second voltage input due to the first analog switch chip U7
The outfan electrical connection of pin SB and the 3rd high impedance voltage follow circuit, therefore the voltage of the first analog switch chip U7 is defeated
The output voltage going out pin D is equal to direct current small voltage signal, it is achieved thereby that galvanic output.
The alternating current of unidirectional current identification circuit output enters unidirectional current output control circuit, and by controlling with unidirectional current output
The aviation socket 8 of circuit electrical connection exports, the DC current (such as: DC15mA) of its output and the high-voltage alternating of bus
Electricity (such as: DC1500V) linearly ratio.
It can thus be seen that the embodiment of the present invention can be applied not only to two kinds of power systems of AC and DC, and structure
Simply, reliability height, highly versatile, be easily installed.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replace
Change, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with claims
Protection domain is as the criterion.
Claims (7)
1. an alternating-current and direct-current dual-purpose voltage transformer, is series between high voltage bus and common ground end, and its feature exists
In, including: insulation crust (1), casing (2), high-voltage arm resistance (4), low-voltage arm resistance (5), protection dress
Put (6), voltage signal processing unit (7) and aviation socket (8)；
Insulation crust (1) is arranged between the top of casing (2), and insulation crust (1) and casing (2) and is provided with
Positioning seat (3)；
The inside of insulation crust (1) is provided with cavity (11)；High-voltage arm resistance (4), low-voltage arm resistance (5) and protection
Device (6) is all located in this cavity (11)；The high-pressure side of high-voltage arm resistance (4) be located at insulation crust (1) top
High-field electrode binding post (9) electrical connection, and this high-field electrode binding post (9) electrically connects with high voltage bus；High pressure
The low-pressure end of arm resistance (4) electrically connects with the high-pressure side of low-voltage arm resistance (5), the low-pressure end of low-voltage arm resistance (5) with
Common ground end electrically connects；The input of protection device (6) is in parallel with low-voltage arm resistance (5)；
Voltage signal processing unit (7) is located at the inside of casing (2), and the input of voltage signal processing unit (7)
End electrically connects with the outfan of protection device (6)；Aviation socket (8) is located at the outside of casing (2), and voltage letter
The outfan of number processing unit (7) electrically connects with aviation socket (8)；
Voltage signal processing unit (7) includes that the output of unidirectional current identification circuit, alternating current identification circuit, unidirectional current controls electricity
Road and alternating current output control circuit；The input of unidirectional current identification circuit and the input of alternating current identification circuit are connected in parallel on
The outfan of protection device (6)；The outfan of unidirectional current identification circuit is electrically connected with the input of unidirectional current output control circuit
Connect；The outfan of alternating current identification circuit electrically connects with the input of alternating current output control circuit；Unidirectional current output controls
The outfan of circuit is connected in parallel on aviation socket (8) with the outfan of alternating current output control circuit.
Alternating-current and direct-current dual-purpose voltage transformer the most according to claim 1, it is characterised in that described unidirectional current
Identification circuit includes: the first high impedance voltage follow circuit, the 15th resistance (R15), the 7th diode (D7),
4th 1 resistance (R41), the four or two electric capacity (C42), the first voltage comparator circuit, the first analog switch chip
(U7) and the second high impedance voltage follow circuit；
The input of the first high impedance voltage follow circuit electrically connects with the outfan of protection device (6)；First high impedance electricity
The outfan of pressure follow circuit is by the 15th resistance (R15) and one end of the four or two electric capacity (C42) and the first voltage ratio
The first of relatively circuit compares voltage input end electrical connection；The other end of the four or two electric capacity (C42) is electrically connected with common ground end
Connect；
The negative electrode of the 7th diode (D7) and the outfan electrical connection of the first high impedance voltage follow circuit；7th diode
(D7) anode and the series connection of the 4th 1 resistance (R41), and it is connected electrically in the 15th electricity by the 4th 1 resistance (R41)
Between resistance (R15) and the four or two electric capacity (C42)；
The second of first voltage comparator circuit is compared voltage input end and accesses more than or equal to 0.18V, and less than 0.24V's
DC input voitage；The comparative result outfan of the first voltage comparator circuit and the sheet choosing of the first analog switch chip (U7)
Signal input pin (In) electrically connects；
First voltage input pin (SA) of the first analog switch chip (U7) electrically connects with common ground end；First mould
The outfan of the second voltage input pin (SB) and the first high impedance voltage follow circuit of intending switch chip (U7) is electrically connected
Connect；The voltage output pin (D) of the first analog switch chip (U7) and the input of the second high impedance voltage follow circuit
End electrical connection, and electrically connected with the input of unidirectional current output control circuit by the second high impedance voltage follow circuit.
Alternating-current and direct-current dual-purpose voltage transformer the most according to claim 1, it is characterised in that described alternating current
Identification circuit includes: the 3rd high impedance voltage follow circuit, the 4th zero resistance (R40), the seven or two diode
(D72), the 9th 2 diode (D92), the eight or two diode (D82), the 2nd 91 resistance (R291),
Four or two resistance (R42), the 5th electric capacity (C5), the second voltage comparator circuit and the second analog switch chip (U82)；
The input of the 3rd high impedance voltage follow circuit electrically connects with the outfan of protection device (6)；3rd high impedance electricity
The outfan of pressure follow circuit is electrically connected with the anode of the seven or two diode (D72) by the 4th zero resistance (R40)；The
The negative electrode of seven or two diodes (D72) and the anode electrical connection of the 9th 2 diode (D92)；9th 2 diode
(D92) negative electrode and the anode electrical connection of the eight or two diode (D82)；The negative electrode of the eight or two diode (D82) with
One end of 5th electric capacity (C5) and the first of the second voltage comparator circuit compare voltage input end electrical connection；5th electric capacity
(C5) the other end electrically connects with common ground end；
One end of 2nd 91 resistance (R291) electrically connects with the anode of the seven or two diode (D72), and the 2nd 91
The other end of resistance (R291) and the negative electrode electrical connection of the 9th 2 diode (D92)；Four or two resistance (R42)
One end electrically connects with the anode of the eight or two diode (D82), and the other end and the 8th 22 of the four or two resistance (R42)
The negative electrode electrical connection of pole pipe (D82)；
The second of second voltage comparator circuit is compared voltage input end and accesses more than or equal to 1.6V, and the direct current less than 8V
Input voltage；The comparative result outfan of the second voltage comparator circuit and the chip selection signal of the second analog switch chip (U82)
Input pin (In) electrically connects；
First voltage input pin (SA) of the second analog switch chip (U82) electrically connects with common ground end；Second
Second voltage input pin (SB) of analog switch chip (U82) and the outfan of the 3rd high impedance voltage follow circuit
Electrical connection；The voltage output pin (D) of the second analog switch chip (U82) and the input of alternating current output control circuit
End electrical connection.
Alternating-current and direct-current dual-purpose voltage transformer the most according to claim 1, it is characterised in that described alternating current
Output control circuit includes: the one or three operational amplifier (U13), the diode July 1st (D71), the 2nd 1 resistance
(R21), the 4th audion (T4), the 2nd 41 resistance (R241), the 8th 1 diode (D81), second
Eight resistance (R28), the 6th audion (T6), second resistance on May Day (R251) and the two or seven resistance (R27)；
The in-phase input end of the one or three operational amplifier (U13) electrically connects with the outfan of alternating current identification circuit；One or three
The inverting input of operational amplifier (U13) and one end electrical connection of the two or seven resistance (R27), and as this alternating current
One current output terminal of output control circuit electrically connects with aviation socket (8)；The other end of the two or seven resistance (R27)
Electrically connect with common ground end；
The outfan of the one or three operational amplifier (U13) and the negative electrode electrical connection of the diode July 1st (D71)；The July 1st
The anode of diode (D71) is electrically connected with+15V voltage input end by the 2nd 1 resistance (R21)；4th audion
(T4) base stage electrically connects with the anode of the diode July 1st (D71)；The colelctor electrode of the 4th audion (T4) with
+ 15V voltage input end electrically connects；The emitter stage of the 4th audion (T4) and one end electricity of the 2nd 41 resistance (R241)
Connect；
The outfan of the one or three operational amplifier (U13) and the anode electrical connection of the 8th 1 diode (D81)；8th 1
The negative electrode of diode (D81) is electrically connected with-15V voltage input end by the two or eight resistance (R28)；6th audion
(T6) base stage electrically connects with the negative electrode of the 8th 1 diode (D81)；The colelctor electrode of the 6th audion (T6) with-
15V voltage input end electrically connects；The emitter stage of the 6th audion (T6) and the one end on second resistance on May Day (R251) electricity
Connect；
After the other end of the 2nd 41 resistance (R241) and the electrical connection of the other end on second resistance on May Day (R251), as
Another current output terminal of this alternating current output control circuit electrically connects with aviation socket (8).
Alternating-current and direct-current dual-purpose voltage transformer the most according to claim 1, it is characterised in that described unidirectional current
Output control circuit includes: analog to digital conversion circuit, central processing element and D/A converting circuit；
Central processing element is electrically connected with the outfan of unidirectional current identification circuit by analog to digital conversion circuit, thus obtains direct current
The voltage signal of electricity；Central processing element is electrically connected with aviation socket (8) by D/A converting circuit, so that aviation is inserted
Seat (8) output unidirectional current.
Alternating-current and direct-current dual-purpose voltage transformer the most according to claim 5, it is characterised in that described casing
(2) outside is provided with work condition indicator；
Alternating current output control circuit includes alternate current operation state-feedback circuit；Central processing element is anti-with alternate current operation state
Current feed circuit electrically connects, and electrically connects with work condition indicator.
Alternating-current and direct-current dual-purpose voltage transformer the most according to any one of claim 1 to 6, it is characterised in that institute
The protection device (6) stated including: discharge tube (G1), the first resettable fuse (Ra), the second self-recoverage insurance
Silk (Rn) and the first transient voltage protection diode (TVS1)；
One end of first resettable fuse (Ra) electrically connects with one end of discharge tube (G1), and as protection device
(6) a input electrically connects with the high-pressure side of low-voltage arm resistance (5)；First resettable fuse (Ra) another
One end electrically connects with one end of the first transient voltage protection diode (TVS1), and as one of protection device (6)
Outfan electrically connects with the input of voltage signal processing unit (7)；
One end of second resettable fuse (Rn) electrically connects with the other end and the common ground end of discharge tube (G1), and
Electrically connect with the low-pressure end of low-voltage arm resistance (5) as another input of protection device (6)；Second self-recoverage is protected
The other end electrical connection of the other end of danger silk (Rn) and the first transient voltage protection diode (TVS1), and as protection
Another outfan of device (6) electrically connects with the input of voltage signal processing unit (7).
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| CN201310652856.2A CN103675389B (en) | 2013-12-05 | 2013-12-05 | A kind of alternating-current and direct-current dual-purpose voltage transformer |
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| CN201310652856.2A CN103675389B (en) | 2013-12-05 | 2013-12-05 | A kind of alternating-current and direct-current dual-purpose voltage transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106546790A (en) * | 2016-11-25 | 2017-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of differential configuration resitstance voltage divider |
| CN106932629B (en) * | 2017-03-08 | 2019-09-20 | 许继集团有限公司 | Voltage check device, impedance isolation circuit and control method |
| CN110018367A (en) * | 2018-01-06 | 2019-07-16 | 苏州电器科学研究院股份有限公司 | Diode pedestal signal pickup assembly |
| CN112098705B (en) * | 2020-09-17 | 2021-10-26 | 株洲中车时代电气股份有限公司 | System and method for rapidly identifying AC/DC power supply system |
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